. Electrical world. and thoroughly insulated. Everycoil is soaked in a varnish bath, then baked, after which it is cov-ered with two layers of friction tape, finally receiving two coats ofinsulating paint. The brush holders are of the very simplest and most effectivedesign, and of the lightest possible construction consistent with nec-essary strength and durability. The brushes are of carbon and arefastened rigidly at the end of the holder. As there is no slidingfriction of the brush in the holder, the spring has but little weightto move, so that the tension is very light; this results in a ve
. Electrical world. and thoroughly insulated. Everycoil is soaked in a varnish bath, then baked, after which it is cov-ered with two layers of friction tape, finally receiving two coats ofinsulating paint. The brush holders are of the very simplest and most effectivedesign, and of the lightest possible construction consistent with nec-essary strength and durability. The brushes are of carbon and arefastened rigidly at the end of the holder. As there is no slidingfriction of the brush in the holder, the spring has but little weightto move, so that the tension is very light; this results in a very quick and sensitive adjustment of the brush, which eliminates sparkingand heating and wearing of the commutator. The holder is clampedto the stud and is provided with a simple and ready means for ad-justment if that is ever required. The brushes are properly set inthe factory and should not require adjusting under any conditionof load, or overload. The machines are rated well within their limits of capacity, and,. FIG. 2.—STEEL .\ND .MOTOR. as open machines, no part will heat more than 40° C. above thesurrounding air, when operated for ten hours under full load. Theywill withstand an overload of £0 per cent, for a period of one hour,and a momentary overload of 100 per cent, without injury. As en-tirely enclosed machines the ratings will be somewhat less, to meetthese requirements. Attaching Plug and Socket. - i^ A patent was recently allowed to Mr. W. H. Kelsey, of the Elec-tric Building, Cleveland, on an attaching plug and lamp socketherewith illustrated. When this device is made as an electric at-taching plug, and the reversing ends contain anEdison or Thomson-Houston plug contact,with electric connections to the supportingarms within the holder, then, by the simpleturning or reversing of the ends of the doubleplug, either the Edison or the Thomson-Hous-ton plug end is presented for attaching to itsproper socket. Another feature this device hasis the avoi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
